CN113865665B - Method for detecting water level and device applying same - Google Patents

Method for detecting water level and device applying same Download PDF

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Publication number
CN113865665B
CN113865665B CN202111114585.6A CN202111114585A CN113865665B CN 113865665 B CN113865665 B CN 113865665B CN 202111114585 A CN202111114585 A CN 202111114585A CN 113865665 B CN113865665 B CN 113865665B
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water
evaporator
detecting
water tank
water level
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CN202111114585.6A
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CN113865665A (en
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刘群
潘叶江
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Vatti Co Ltd
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Vatti Co Ltd
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • A47J27/04Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00Parts, details or accessories of cooking-vessels
    • A47J36/32Time-controlled igniting mechanisms or alarm devices
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00Baking; Roasting; Grilling; Frying
    • A47J37/06Roasters; Grills; Sandwich grills
    • A47J37/0623Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • A47J27/04Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
    • A47J2027/043Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels for cooking food in steam

Abstract

The application relates to the technical field of water level detection, in particular to a method for detecting water level, which comprises the following steps: s1: detecting the water level of the water tank in real time, and entering the next step if a water shortage state occurs; s2: monitoring and comparing the temperature Temp of the evaporator with the set temperature Targ in real time, and entering the next step if the temperature Temp of the evaporator is higher than the set temperature Targ; s3: and continuously monitoring and comparing the relation between the evaporator temperature Temp and the set temperature Targ after the water pump works for a specified time in real time, repeating the step S2 if the evaporator temperature Temp is reduced, and repeating the step S1 after the water tank is filled with water if the evaporator temperature Temp is not reduced. The application has the preliminary rough detection of the water level and the accurate water level detection under the state of small water quantity which is in seamless connection with the preliminary rough detection, thereby realizing high-precision detection; the water level detection device has the advantages that the water channel abnormality detection function is arranged in each link of water level detection in a matched mode, whether the water tank is lack of water or not and whether the water channel is abnormal can be accurately reminded, and long-term safe use of the device is guaranteed.

Description

Method for detecting water level and device applying same
Technical Field
The application relates to the technical field of water level detection, in particular to a method for detecting water level and a device applying the method.
Background
There are many devices that need to detect the water level during operation, for example: the general steaming and baking oven adopts a floater as a water level detection device, and the main principle is a reed switch principle, so that only water or no water can be detected, and when the steaming and baking oven is used in a product, the water tank can be used for displaying at least one third of water, but the product reports a warning of water shortage. If the waterway of the product is abnormal, misjudgment can also occur, the user experience is poor due to a light person, and the product misinformation warning is not working due to a heavy person.
Therefore, traditional water level detection detects the water level through the reed pipe, when detecting that water is full, the reed pipe disconnection, and the level that the main control detected MCU is high level, otherwise when detecting no water, reminds the user to add water when no water, and in fact the water tank probably has a lot of water because of the reed pipe detects the reason, if the product water route appears unusual, also can appear erroneous judgement.
Disclosure of Invention
The application aims to provide a method for detecting water level, which solves the defects that the water level cannot be accurately calculated, false alarm is easy to occur, whether a waterway is abnormal or not cannot be judged and the like in the prior art.
In order to achieve the above purpose, the technical scheme of the application is as follows:
a method of detecting a water level, comprising the steps of:
s1: detecting the water level of the water tank in real time, and entering the next step if a water shortage state occurs;
s2: monitoring and comparing the temperature Temp of the evaporator with the set temperature Targ in real time, and entering the next step if the temperature Temp of the evaporator is higher than the set temperature Targ;
s3: and continuously monitoring and comparing the relation between the evaporator temperature Temp and the set temperature Targ after the water pump works for a specified time in real time, repeating the step S2 if the evaporator temperature Temp is reduced, and repeating the step S1 after the water tank is filled with water if the evaporator temperature Temp is not reduced.
Furthermore, in the step S1, the water level of the water tank is detected by a reed pipe liquid level meter in real time.
Further, the method for detecting the water tank by the reed pipe liquid level meter comprises the following steps: when water is full, the reed switch is opened, and when water is lack, the reed switch is closed.
Further, the method for judging the drop of the evaporator temperature Temp in S3 is as follows:
the set temperature difference is: tx;
judging whether the evaporator temperature accords with Temp < = (Targ-Tx);
if yes, repeating the step S2, if not, then the alarm water tank is free of water, and repeating the step S1 after the user adds water.
Further, the step S1 further includes a waterway abnormality monitoring method, including the following steps:
s1, judging whether the water shortage state is met or not (Targ-Tx);
if yes, alarming waterway abnormality;
if not, the waterway is in a normal state, and the next step is carried out.
Further, the evaporator temperature Temp is compared with the preset temperature Targ after the water pump is operated for a certain time and the waiting time Td is set in the step S3.
Furthermore, when the water shortage of the water tank is detected in the step S1, the water quantity left in the water tank is V1, the water flow rate of the water pump per second is Q, the time T1 = V1/Q for the water pump to drain the water tank, and the working time T of the water pump is started in the step S3, wherein T < < T1.
Further, the number of times of water pump start is N, judge whether accord with condition V1< = N t Q, if yes, the warning water tank is anhydrous.
Further, the water flow rate Q of each second of the water pump is provided with a numerical real-time adjustment method:
recording from the first time when the alarm water tank is anhydrous, wherein the number of times of alarm is nth time;
qn=v1/(n×t) from the first anhydrous alarm to the nth anhydrous alarm;
recording the values of Q1 to Qn;
and taking an average value of Q1 to Qn as the water flow Q per second used in calculation in the current detection step.
Further, the Q1 to Qn are ordered according to the values, and the average value is taken after the maximum value and the minimum value are removed to be used as the water flow Q per second used in calculation in the current detection step.
Further, the waiting time Td is gradually decreased as the number of times the water pump is turned on is increased.
The device for detecting the water level detects the water level of the water tank by using a water level detection method, the water level detection device comprises a water tank, a reed pipe liquid level meter is arranged in the water tank, the water tank is connected with a water inlet of a water pump through a water inlet pipe, a water outlet of the water pump is connected with an evaporator through a water outlet pipe, a heating pipe and a temperature sensor are arranged in the evaporator, a steam outlet of the evaporator is connected with a steam baking cavity through a steam output pipe, and the water pump, the evaporator, the reed pipe liquid level meter, the heating pipe and the temperature sensor are all connected with an MCU.
The beneficial effects achieved by the application are as follows:
the water level detection device has the advantages that the water level detection device has the preliminary rough detection and the accurate water level detection under the small water quantity state which is in seamless connection with the preliminary rough detection, so that the high-accuracy detection is realized; the water level detection device has the advantages that the water channel abnormality detection function is arranged in each link of water level detection in a matched mode, whether the water tank is lack of water or not and whether the water channel is abnormal can be accurately reminded, and long-term safe use of the device is guaranteed.
Drawings
FIG. 1 is a flow chart of a method of detecting water level according to the present application;
fig. 2 is a schematic structural composition of an embodiment of the apparatus for detecting a water level.
In the figure, 1, a water tank; 2. a water inlet pipe; 3. a water pump; 4. a water outlet pipe; 5. an evaporator; 6. steaming and baking cavity; 7. reed pipe level gauge; 8. heating pipes; 9. a temperature sensor; 10. and a steam output pipe.
Detailed Description
In order to facilitate understanding of the application by those skilled in the art, a specific embodiment of the application is described below with reference to the accompanying drawings.
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application provides a water level detection method, which is applied to a water level detection process of a device needing to detect the water level, as shown in fig. 2, the device detecting the water level comprises a water tank 1, a water inlet pipe 2, a water pump 3, a water outlet pipe 4, an evaporator 5, a steaming and baking cavity 6, a reed pipe liquid level meter 7, a steam output pipe 10, an MCU and other main components, wherein the reed pipe liquid level meter 7 is arranged in the water tank 1, a heating pipe 8 and a temperature sensor 9 are arranged in the evaporator 5, a water inlet of the water pump is connected with the water tank through the water inlet pipe, a water outlet of the water pump is connected with the evaporator through the water outlet pipe, a steam outlet of the evaporator is connected with the steaming and baking cavity through the steam output pipe, and the water pump 3, the evaporator 5, the reed pipe liquid level meter 7, the heating pipe 8 and the temperature sensor 9 are all connected with the MCU. The device for detecting the water level is exemplified by a steaming oven, when the steaming oven works, water is firstly added into a water tank, a water pump pumps the water in the water tank through a water inlet pipe and injects the water into an evaporator through a water outlet pipe, the evaporator works to heat the injected water through a heating pipe, steam is generated and is output into a steaming cavity 6 through a steam output pipe, the processed food in the steaming cavity is steamed, the water pump continuously pumps the water in the water tank in the using process, the water level in the water tank continuously drops, firstly, the primary rough detection of the water level is carried out through a reed pipe liquid level meter, a reed pipe in the reed pipe liquid level meter is also called a magnetron, the switch element is controlled by utilizing a magnetic field signal, and when the magnetic field is not available, the circuit is disconnected, and the state of mechanical movement or the circuit can be detected. When the magnetic switch is not in the working state, the two reeds in the glass tube are not contacted. When the magnetic substance approaches the glass tube, the two reeds are magnetized to attract each other under the action of the magnetic field, so that the circuit is completed. When the magnetic substance disappears, the two reeds are separated due to the elasticity of the reeds without the influence of external magnetic force, and the circuit is disconnected. When the reed pipe liquid level meter detects that water is full, the reed pipe is disconnected, the level of the MCU is high, otherwise, the water is not really in a water shortage state, the water quantity can be roughly detected through the reed pipe liquid level meter, when the water tank is detected to be water shortage, a certain quantity of water is still available in the water tank in practice, the water quantity can still maintain the operation of the steaming oven for a certain time, and the more accurate detection of the liquid level of the residual water quantity is carried out through a scientific calculation method in the following detailed description.
The volume of the water inlet pipe is Vi, the volume of the water outlet pipe is Vo, the water flow rate of the water pump per second is Q, the length of the water tank is l, the width of the water tank is w, and the height of the water tank is h, so that the volume Vs=l, w, h of the water tank; according to the above formula, the theoretical time t=vs/Q for pumping the complete tank of water by the water pump. The calculation process can calculate the total time T for the water pump to completely pump the water in the water tank, and the running total time of the water pump from the full water state to the anhydrous state of the water tank cannot exceed the total time T.
In this embodiment, a more accurate detection method after the reed switch liquid level meter detects the water shortage state is described in detail with reference to fig. 1, firstly, when the water quantity is sufficient, the steaming mode is started after the steaming oven starts to operate, the water pump continuously operates, the real-time temperature Temp of the evaporator is monitored, and in addition, a set temperature Targ and a temperature difference Tx for temperature comparison are set, if Temp > (Targ-Tx) are set, the user is reminded that the waterway is abnormal, otherwise, the waterway is proved to be in a normal state, and the next step can be performed. The relation of real-time temperature Temp of the evaporator and set temperature Targ is monitored in real time, the condition of the waterway can be judged according to the relation of Temp and (Targ-Tx), whether the waterway is abnormal or not is found in time, a user is reminded, and damage to the steaming oven caused by using the steaming oven in a water-deficient state is avoided.
In this embodiment, the method for detecting the water level includes the following steps S1: and detecting the water level of the water tank in real time, and entering the next step if the water shortage state occurs.
In this embodiment, with the continuous operation of the steaming and baking box, after the water level drops to a certain extent, the reed switch liquid level gauge first monitors the water shortage, and then needs to enter the next accurate water level detection after the water shortage, at this time, the water volume with the volume of V1 remains in the water tank, and the theoretical calculation obtains time t1=v1/Q, so the water tank can be pumped down by the water pump with time T1. The value of V1 cannot be very accurate, but the average value can be obtained by carrying out multiple value calculation under the condition of normal detection of the reed pipe liquid level meter, the time T1 is obtained by calculation, the running time of the water pump under the condition of water shortage does not exceed the time T1, the time is used for limiting and protecting the accurate water level detection calculation time, and the second step is used as a reference for calculating the working time T for starting the water pump when the temperature Temp of the evaporator is greater than the set temperature Targ.
In this embodiment, the method for detecting the water level includes step S2: the evaporator temperature Temp is monitored and compared with the set temperature Targ in real time, and if the evaporator temperature Temp is higher than the set temperature Targ, the next step is carried out. If the temperature Temp of the evaporator is higher than the set temperature Targ, the water tank is possibly anhydrous, and the rapid and repeated comparison of the temperature Temp of the evaporator and the set temperature Targ is needed immediately, so that the aim of preventing the evaporator from being damaged due to ultrahigh temperature under the anhydrous condition is fulfilled.
In this embodiment, the method for detecting the water level includes step S3: and continuously monitoring and comparing the relation between the evaporator temperature Temp and the set temperature Targ after the water pump works for a specified time in real time, repeating the step S2 if the evaporator temperature Temp is reduced, and repeating the step S1 after the water tank is filled with water if the evaporator temperature Temp is not reduced.
In this embodiment, in the water tank water shortage state, the detection calculation process starts, firstly, the evaporator is started, the evaporator temperature Temp is continuously monitored in real time, when the evaporator temperature Temp is greater than the set temperature Targ, the working time T (T < < T1) of the water pump is set by calculation, if the temperature Temp < = (Targ-Tx) of the evaporator at this time is lower than the set temperature, the detection process is continuously repeated, the number of times the water pump is started in the water tank from water shortage to water pumping is N until V1< = N x T Q, the water tank water shortage is judged, the steaming oven alerts the user that the water tank is water-free, meanwhile, in the detection process, if the temperature Temp > (Targ-Tx) of the evaporator appears, the water tank is also warned that the water tank is water-free by the horse, the user needs to add water, the state is recorded at this time, the detection is continuously performed, if the temperature of the evaporator still keeps Temp > (Targ-Tx), the water channel is reminded of the user that the water channel is required to be overhauled. The process comprises detection of two conditions, wherein one is that the temperature of the evaporator is too high due to the fact that water in the water tank is not available, the other is that the water pump is abnormal in water path, the water cannot be normally conveyed to the evaporator, the evaporator cannot be normally cooled, the temperature of the evaporator is too high due to the fact that the two conditions are too high, judgment is distinguished through strict logic analysis and calculation, a user is reminded of specific conditions which occur at present, correct alarm is carried out, the user is facilitated to know the actual use condition of the device in time, two anhydrous alarm calculation methods are provided, the alarm is more accurate, and the safe use of the device is further guaranteed.
In step S2 of the embodiment, after the water pump is operated for a period of time T (T < < T1), the waiting time Td is needed to continuously compare the evaporator temperature Temp with the set temperature Targ, after the waiting time Td, the evaporator temperature Temp > (Targ-Tx) is also found, and the water tank is free of water, so that the above process is because the water tank is considered to be free of water, the evaporator is required to be cooled again after the water pump is operated for a period of time T, and after a reasonable cooling time is given, the evaporator temperature Temp can be monitored more accurately, and the calculation accuracy of the method can be effectively improved; as the number of pump runs increases, the Td time is gradually decreased in order to prevent false alarm of the temperature sensor open circuit abnormality caused by too rapid a temperature surge in the evaporator during the waiting time Td.
In this embodiment, when the steam oven is used for a long time, the adjustment of the water flow Q value of each second of the water pump working every second needs to be done at any time, the water tank reed pipe detects the water shortage to the no-water alarm, the number of times of recording the alarm is N from when the user is reminded of adding water for the first time, and the water flow Q of each second of the water pump working every second is prevented from changing continuously along with the increase of the service time from q1=v1/(n×t) to qn=v1/(n×t) of the nth no-water alarm, Q1, Q2 and Qn are sequenced according to the numerical values, and the average value is taken after the maximum and minimum values are removed as the water flow Q of each second used in the calculation in the current detection process.
In summary, the detection method has the advantages that: the intelligent control method is adopted, so that the reliability is high; the method has the advantages that the method comprises the steps of preliminary rough detection of the water level and accurate water level detection under a small water quantity state in seamless connection with the preliminary detection, so that high-accuracy detection is realized; each link of water level detection cooperates to set up the unusual detection function in water route, can be accurate remind whether the water tank lacks water and the water route is unusual, and the function is various, guarantees the long-term safe handling of device.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It will be understood that when an element is referred to as being "mounted" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
The embodiments of the present application described above do not limit the scope of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of the present application as set forth in the appended claims.

Claims (9)

1. A method of detecting a water level, characterized by: the method comprises the following steps:
s1: detecting the water level of the water tank in real time, and entering the next step if a water shortage state occurs;
s2: monitoring and comparing the temperature Temp of the evaporator with the set temperature Targ in real time, and entering the next step if the temperature Temp of the evaporator is higher than the set temperature Targ;
s3: continuously monitoring and comparing the relation between the evaporator temperature Temp and the set temperature Targ after the water pump works for a specified time in real time, repeating the step S2 if the evaporator temperature Temp is reduced, and repeating the step S1 after the water tank is filled with water if the evaporator temperature Temp is not reduced and the alarm water tank is not filled with water;
the judging method for the temperature Temp drop of the evaporator in the S3 is as follows:
the set temperature difference is: tx;
judging whether the evaporator temperature accords with Temp < = (Targ-Tx);
if yes, repeating the step S2, if not, enabling the alarm water tank to be free of water, and repeating the step S1 after the user adds water;
the number of times of starting the water pump is N, whether the water pump meets the condition V1< = N t Q is judged, and if yes, the alarm water tank is anhydrous;
when the water shortage of the water tank is detected in the S1, the water quantity left in the water tank is V1, the water flow rate of the water pump per second is Q, the time T1 = V1/Q for the water pump to pump the water tank is used for pumping the water tank, and the working time T of the water pump is started in the S3, wherein T < < T1.
2. The method for detecting water level according to claim 1, wherein S1 further comprises a waterway abnormality monitoring method, comprising the steps of:
s1, judging whether the water shortage state is met or not (Targ-Tx);
if yes, alarming waterway abnormality;
if not, the waterway is in a normal state, and the next step is carried out.
3. A method of detecting a water level as claimed in claim 2, wherein: and S3, after the water pump works for a certain time and waiting time Td, comparing the relation between the evaporator temperature Temp and the set temperature Targ.
4. A method of detecting a water level as claimed in claim 1, wherein: the water flow rate Q of the water pump per second is provided with a numerical value real-time adjustment method:
recording from the first time when the alarm water tank is anhydrous, wherein the number of times of alarm is nth time;
qn=v1/(n×t) from the first anhydrous alarm to the nth anhydrous alarm;
recording the values of Q1 to Qn;
and taking an average value of Q1 to Qn as the water flow Q per second used in calculation in the current detection step.
5. A method of detecting a water level as claimed in claim 4, wherein: and the Q1-Qn are sequenced according to the numerical values, and the average value is taken as the water flow Q per second used in calculation in the current detection step after the maximum value and the minimum value are removed.
6. A method of detecting a water level according to claim 3, wherein: the waiting time Td gradually decreases with the increase of the number N of the water pump on.
7. A method of detecting a water level as claimed in claim 1, wherein: and in the step S1, the water level of the water tank is detected by a reed pipe liquid level meter in real time.
8. A method of detecting a water level as claimed in claim 7, wherein: the method for detecting the water tank by the reed pipe liquid level meter comprises the following steps: when water is full, the reed switch is opened, and when water is lack, the reed switch is closed.
9. A device for detecting water level, characterized in that: the device for detecting the water level detects the water level of the water tank by adopting the method for detecting the water level according to any one of claims 1-8, the device for detecting the water level comprises the water tank, a reed pipe liquid level meter is arranged in the water tank, the water tank is connected with a water inlet of a water pump through a water inlet pipe, a water outlet of the water pump is connected with an evaporator through a water outlet pipe, a heating pipe and a temperature sensor are arranged in the evaporator, a steam outlet of the evaporator is connected with a steam baking cavity through a steam output pipe, and the water pump, the evaporator, the reed pipe liquid level meter, the heating pipe and the temperature sensor are all connected with an MCU.
CN202111114585.6A 2021-09-23 2021-09-23 Method for detecting water level and device applying same Active CN113865665B (en)

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